I-calculator yemithetho ye-Ohm
Kuxazululwe i-voltage, umsinga, ukumelana noma amandla — faka noma yikuphi okubini kwezine.
Iziphetho zivuselelwa uma ubhala.
Malunga nale khadi
Ohm's law is the single most-used relationship in electronics: the voltage across a resistor equals the current through it times its resistance, V = I × R. Rearranged, the current is I = V / R and the resistance is R = V / I. Power — the rate at which the component turns electrical energy into heat or work — adds a second relationship, P = V × I, which combines with Ohm's law to give the two equivalents P = I² × R and P = V² / R. Together these four quantities form the V–I–R–P 'Ohm's law wheel', and knowing any two of them fixes the other two.
This calculator lets you pick which quantity to solve for and enter any two of the others, then returns the full wheel plus the three equivalent power formulas side by side. For example, a 12 V supply driving a 6 Ω resistor gives I = 12 / 6 = 2 A and P = 12 × 2 = 24 W; check it with P = I² × R = 4 × 6 = 24 W and P = V² / R = 144 / 6 = 24 W, all agreeing. Because the tool back-fills every missing value, entering power and current instead is just as valid — 24 W at 2 A returns 12 V and 6 Ω.
Ohm's law holds exactly for any DC resistive circuit and for the resistive part of an AC circuit, which makes it the everyday tool for sizing current-limiting resistors, choosing LED droppers, working out fuse and wire ratings, reading how much a heater or motor will draw, and predicting the heat a resistor must dissipate. It does not by itself describe capacitors, inductors or non-ohmic parts like diodes, where the voltage–current relationship is no longer a straight line.
Imibuzo ebuzwa kaningi
Yini umthetho ka-Ohm?
Imithetho ye-Ohm ichaza ukuthi umsinga osuka ku-conductor ulingana ne-voltage ngaphesheya kwayo: V = I × R. Iphinde yamiswa, I = V / R ne-R = V / I.
Ngiyithola kanjani amandla kagesi kusuka kumthetho kaOhm?
Umandla yisikhathi se-voltage isikhathi esikhona, P = V × I. Ukusebenzisa umthetho ka-Ohm ungabhala futhi njenge-P = I² × R noma i-P = V² / R — zonke ezintathu zinikeza ama-watts afanayo.
Yini amaxabiso amabili engifaka?
Khetha inani elilahlekile ku "Solution for", bese ufaka noma yiziphi ezimbili ezikhona. Ukuthola ukumelana unganikeza i-voltage kanye ne-current, noma amandla kanye ne-current.
Ingabe ngisebenzisa amandla endaweni ye-voltage noma i-current njenge-input?
Yebo. Indawo yokusebenza ethuthukisiwe ikuvumela ukuthi uxazulule kusuka kumandla ongeziwe okunye ubukhulu — isibonelo, 24 W kufaka ku-2 A ibuyisela 12 V no-6 Ω, usebenzisa i-V = P / I ne-R = P / I².
Ingabe umthetho kaOhm usebenza kuma-circuits we-AC?
Isebenza ngokuqondile kungxenye emelana ne-AC circuit. Isebenzisa ama-circuits ane-capacitors noma ama-inducers ushintsha ukumelana no-impedance, futhi amandla athatha i-power factor, kodwa i-resistor elula ilandela i-V = I × R ngaso sonke isikhathi.
Kungani i-resistor yami ithola ukushisa - inamandla angakanani akhipha?
Umncintiswano ushintsha amandla kagesi abe ukushisa ku P = I² × R watts. Umncintiswano we-6 Ω ophethe i-2 A ususa 4 × 6 = 24 W, ngakho-ke udinga amandla aphezulu ngaphezu kwalokho. Ukuncipha kwe-wattage kuyisizathu esijwayelekile sokuqhuma noma ukulahlekelwa umncintiswano.
Ingabe lokhu kuphatha izingxenye ezingaba yi-linear ezifana ne-diodes noma i-LEDs?
Akukho. Ohm umthetho ithatha ukumelana njalo, ngakho ayikho imodeli diode, LEDs noma transistors okungukuthi okwamanje ukhula non-linearly nge voltage. For LED ungakwazi endaweni ubukhulu isigaba resistor kusuka ukuhlinzeka voltage kunciphisa LED ukuqhubeka voltage.
API — sebenzisa le calculator kusuka kukhodi
Nquma le calculator njenge JSON evulekile yendawo yokuqeda - akukho isithonjana esidingekayo. Thumela amaxabiso endawo ngezansi njengezilungiselelo zombuzo noma i-JSON. Noma yini ongayishiya isebenzisa iphutha elifanayo elifakwe ngaphambili lekhasi; ipharamitha engaziwa yi-400, ayikho i-zero emnyama. Funda i-API egcwele →
Ingxenye yendawo
GET https://calculator.free/api/v1/ohms-law/curl
curl "https://calculator.free/api/v1/ohms-law/?solve=r&voltage=12¤t=2&resistance=6"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/ohms-law/?" + new URLSearchParams({
"solve": "r",
"voltage": "12",
"current": "2",
"resistance": "6"
}));
const data = await r.json();
console.log(data.results);Izibalo ziyisilinganiso esisetshenziswa ukuqondisa kuphela, hhayi ukucebisa ngezimali, ukwelashwa noma ukukhokha.